78679807 has 2 divisors, whose sum is σ = 78679808. Its totient is φ = 78679806.

The previous prime is 78679787. The next prime is 78679819. The reversal of 78679807 is 70897687.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78679807 - 2¹⁵ = 78647039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78679837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39339903 + 39339904.

It is an arithmetic number, because the mean of its divisors is an integer number (39339904).

Almost surely, 2^78679807 is an apocalyptic number.

78679807 is a deficient number, since it is larger than the sum of its proper divisors (1).

78679807 is an equidigital number, since it uses as much as digits as its factorization.

78679807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 78679807 is about 8870.1638654537. The cubic root of 78679807 is about 428.5035543358.

The spelling of 78679807 in words is "seventy-eight million, six hundred seventy-nine thousand, eight hundred seven".